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[英]How do I write a custom validator in MVC3 for US or Canada zip code validation, based on the selected country?
[英]How do I do Sub Object Custom Validation mvc3
我有一个对象(标头),其中包含子对象(详细信息)的列表,在接受数据之前,我想对这些子对象进行自定义验证。 我已经尝试过ModelState.IsValid和TryValidateModel,但它似乎并未在子对象(仅标题对象)上触发Validate方法。
因此,在提交时,我看到了标题的验证动作,但没有子对象的验证动作。 然后,如果我执行TryValidateModel,我将再次看到(断点)验证方法在标头上调用,但不在子对象上调用。
带注释的验证(必须是数字,等等)似乎在子对象上起作用,而不是通过IValidatableObject接口添加的自定义逻辑。 任何帮助将不胜感激。
我创建一个属性([ValidateObject]),它将验证您放在类中的属性,就像您认为应该做的那样。
public class Personne
{
[ValidateObject]
public Address Address { get; set; }
//[...]
}
(地址是一个自定义类。)
它可以用于验证:
子对象的集合。
[ValidateObject] public List<Address> Address { get; set; }
它支持多层次的部门,如果“地址”具有属性为“ ValidateObject”的属性为“ ZipCode”,则将对其进行验证。
码:
public class ValidateObjectAttribute : ValidationAttribute
{
public ValidateObjectAttribute()
{
}
private ValidationContext ValidationContext { get; set; }
protected override ValidationResult IsValid(object value, ValidationContext validationContext)
{
this.ValidationContext = validationContext;
var results = new List<ValidationResult>();
try
{
var isIterable = this.IsIterable(value);
if (isIterable)
{
int currentItemPosition = -1;
foreach (var objectToValidate in value as IEnumerable<object>)
{
currentItemPosition++;
var resultTemp = ValidationsForObject(objectToValidate, true, currentItemPosition);
if (resultTemp != null)
results.AddRange(resultTemp);
}
if (results.Count <= 0)
results = null;
}
else
results = ValidationsForObject(value);
if (results != null)
{
//Build a validation result
List<string> memberNames = new List<string>();
results.ForEach(r => memberNames.AddRange(r.MemberNames));
var compositeResultsReturn = new CompositeValidationResult($"Validation for {validationContext.DisplayName} failed!", memberNames.AsEnumerable());
results.ForEach(r => compositeResultsReturn.AddResult(r));
return compositeResultsReturn;
}
}
catch (Exception) { }
return ValidationResult.Success;
}
private List<ValidationResult> ValidationsForObject (object objectToValidate, bool IsIterable = false, int position = -1)
{
var results = new List<ValidationResult>();
var contextTemp = new ValidationContext(objectToValidate, null, null);
var resultsForThisItem = new List<ValidationResult>();
var isValid = Validator.TryValidateObject(objectToValidate, contextTemp, resultsForThisItem, true);
if (isValid)
return null;
foreach (var validationResult in resultsForThisItem)
{
List<string> propNames = new List<string>();// add prefix to properties
foreach (var nameOfProp in validationResult.MemberNames)
{
if (IsIterable)
propNames.Add($"{this.ValidationContext.MemberName}[{position}].{nameOfProp}");
else
propNames.Add($"{this.ValidationContext.MemberName}.{nameOfProp}");
}
var customFormatValidation = new ValidationResult(validationResult.ErrorMessage, propNames);
results.Add(customFormatValidation);
}
return results;
}
private bool IsIterable(object value)
{
////COULD WRITE THIS, but its complicated to debug...
//if (value.GetType().GetInterfaces().Any(
//i => i.IsGenericType &&
//i.GetGenericTypeDefinition() == typeof(IEnumerable<>)))
//{
// // foreach...
//}
Type valueType = value.GetType();
var interfaces = valueType.GetInterfaces();
bool isIterable = false;
foreach (var i in interfaces)
{
var isGeneric = i.IsGenericType;
bool isEnumerable = i.GetGenericTypeDefinition() == typeof(IEnumerable<>);
isIterable = isGeneric && isEnumerable;
if (isIterable)
break;
}
return isIterable;
}
}
public class CompositeValidationResult : ValidationResult
{
private readonly List<ValidationResult> _results = new List<ValidationResult>();
public IEnumerable<ValidationResult> Results
{
get
{
return _results;
}
}
public CompositeValidationResult(string errorMessage) : base(errorMessage)
{
}
public CompositeValidationResult(string errorMessage, IEnumerable<string> memberNames) : base(errorMessage, memberNames)
{
}
protected CompositeValidationResult(ValidationResult validationResult) : base(validationResult)
{
}
public void AddResult(ValidationResult validationResult)
{
_results.Add(validationResult);
}
}
如果您的模型正确绑定,这将起作用:)
您可能想要添加必需的属性,以确保对象本身不为null。
[Required]
希望对您有所帮助!
我想知道您的根对象是否有阻止子验证的错误。 请参见使用批注和IValidatableObject进行递归验证。此URL提到了该方案,还提供了从根目录强制对子代进行验证的代码
根据发布触发从根对象进行验证
public IEnumerable Validate(ValidationContext validationContext)
{
var context = new ValidationContext(this.Details, validationContext.ServiceContainer, validationContext.Items);
var results = new List();
Validator.TryValidateObject(this.Details, context, results);
return results;
}
TryValidateObject似乎没有触发自定义验证,只有数据批注? 我通过执行以下操作将详细信息的验证添加到标头验证中:
foreach (var detail in this.Details)
{
var validationResults = detail.Validate(validationContext);
foreach (var validationResult in validationResults)
{
yield return validationResult;
}
}
这在验证方面起作用,但是UI没有显示错误消息。 即使我在UI上有ValidationMessagesFor。
验证无法正常解决,这里: MVC3主详细信息验证未显示
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